关键词: 二氧化二铝, 催化作用, 反应动力学, 表面反应, 速率控制步骤

Abstract: P2O5-MoO3/Al2O3 catalyst was prepared by the incipient-wetness impregnation method to catalyze the synthesis reaction of sec-butyl mercaptan from 1-butene and H2S. After eliminating the influence of internal and external diffusion，the intrinsic reaction kinetics of 1-butene and H2S on P2O5-MoO3/Al2O3 catalyst was studied. The effects of reaction temperature，1-butene partial pressure and H2S partial pressure on reaction rate were investigated under the conditions of 120—180 ℃ and 0.2 MPa. The catalytic mechanism of reaction of 1-butene and H2S on the P2O5-MoO3/Al2O3 catalyst was discussed. The intrinsic reaction mechanism of 1-butene and H2S on P2O5-MoO3/Al2O3 catalyst was dual site mechanism. 1-butene and H2S were co-adsorbed on the catalyst surface to react and form sec-butyl mercaptan and the surface reaction step was the rate-limiting step. According to the dual site mechanism the rate of reaction was derived： Pre-exponential factor k0=3.3×109，activation energy Ea=60.78 kJ/mol.

Key words: alumina, catalysis, reaction kinetics, surface reaction, rate limiting step